70256321 has 4 divisors (see below), whose sum is σ = 70273200. Its totient is φ = 70239444.

The previous prime is 70256317. The next prime is 70256327. The reversal of 70256321 is 12365207.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 70256321 - 2² = 70256317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70256327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2750 + ... + 12168.

It is an arithmetic number, because the mean of its divisors is an integer number (17568300).

Almost surely, 2^70256321 is an apocalyptic number.

It is an amenable number.

70256321 is a deficient number, since it is larger than the sum of its proper divisors (16879).

70256321 is an equidigital number, since it uses as much as digits as its factorization.

70256321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16878.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 70256321 is about 8381.9043778845. The cubic root of 70256321 is about 412.6309515063.

The spelling of 70256321 in words is "seventy million, two hundred fifty-six thousand, three hundred twenty-one".